The drain cap features a solder cup and drain port. The fitting is designed to fit over the end of pipe to seal the end as well as provide a means to drain the pipe. Please refer to NIBCO technical data sheets and catalogs for engineering and installation information. In addition to its inherent qualities of beauty, durability and low maintenance, copper's reusability makes it an ideal application in sustainable projects. NIBCO® copper fittings are manufactured in an ISO 9001 certified facility, and backed by a 50-year limited warranty. Because of its longstanding reputation for precision in design and manufacturing, NIBCO is the preferred brand in the industry.